First On-Line Beta-NMR on Oriented Nuclei: Magnetic Dipole Moments of the \(νp1/2\)-1 1/2- Ground State in 67Ni and \(πp3/2\)+1 3/2- Ground State in 69Cu

The first fully on-line use of the angular distribution of beta emission in detection of NMR of nuclei oriented at low temperatures is reported. The magnetic moments of the single valence particle, intermediate mass, isotopes ⁶⁷Ni\(νp^-1_1/21/2^-\) and ⁶⁹Cu\(πp¹_3/23/2^-\) are measured to be +0.6015 μ_N and +2.841 μ_N, respectively, revealing only a small deviation from the neutron p_1/2 single-particle value in the former and a large deviation from the proton p_3/2 single-particle value in the latter. Quantitative interpretation is given in terms of core polarization and meson-exchange currents.